http://d.puremagic.com/issues/show_bug.cgi?id=3927

           Summary: array.length++; is an error
           Product: D
           Version: 2.041
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2010-03-10 10:12:01 PST ---
With the following D2 program:

void main() {
     int[] array;
     array.length++;
     array.length--;
}


The compiler shows the following errors, is this correct?
test1.d(3): Error: a.length is not an lvalue
test1.d(4): Error: a.length is not an lvalue

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Don <clugdbug@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
                 CC|                            |clugdbug@yahoo.com.au
            Summary|array.length++; is an error |array.length++; is an
                   |                            |error, but ++array.length
                   |                            |compiles


--- Comment #1 from Don <clugdbug@yahoo.com.au> 2012-02-01 04:27:31 PST ---
++array.length;
compiles. The bizarre error is because of the lowering that the compiler uses
internally.

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yebblies <yebblies@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |yebblies@gmail.com
           Platform|x86                         |All
            Version|2.041                       |D1 & D2
         AssignedTo|nobody@puremagic.com        |yebblies@gmail.com
         OS/Version|Windows                     |All


--- Comment #2 from yebblies <yebblies@gmail.com> 2012-02-02 03:32:09 EST ---
https://github.com/D-Programming-Language/dmd/pull/681

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--- Comment #3 from github-bugzilla@puremagic.com 2012-02-22 01:31:11 PST ---
Commit pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/38c9dcde7b25415adf6a1ef2f3eddd83af3a59a8 fix Issue 3927 - array.length++; is an error, but ++array.length compiles

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla@digitalmars.com
            Version|D1 & D2                     |D1


--- Comment #4 from Walter Bright <bugzilla@digitalmars.com> 2012-02-22 01:31:32 PST ---
Fixed for D2 only.

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> --- Comment #4 from Walter Bright <bugzilla@digitalmars.com> 2012-02-22 01:31:32 PST ---
> Fixed for D2 only.

void main() {
       int[] array = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ];
       writeln(array, "~", --array.length);
       assert (array.length == 9);
}

Which one is correct?

Best regards...

No problem...

void main() {
    int[] array = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ];
    writeln(array, "~", ++array.length,
                  "->", --array.length);
    assert (array.length == 10);        // no problem
    writeln(array, "~", array.length);
}

DMD version: 2.057
==================
salih@DB-N150-N210-N220:~/d.ders$ ./dene
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]~11->10
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]~10

Best regards..

http://d.puremagic.com/issues/show_bug.cgi?id=3927


Salih Dincer <salihdb@hotmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |salihdb@hotmail.com


--- Comment #5 from Salih Dincer <salihdb@hotmail.com> 2012-02-22 06:45:38 PST ---
(In reply to comment #4)
> Fixed for D2 only.

void main() {
    int[] array = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ];
    writeln(array, "~", ++array.length,
                  "->", --array.length);
    assert (array.length == 10);        // no problem
    ++array.length;
    --array.length;
    writeln(array, "~", array.length);
}

DMD version: 2.057
==================
salih@DB-N150-N210-N220:~/d.ders$ ./dene
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]~11->10
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]~10

No problem...

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--- Comment #6 from yebblies <yebblies@gmail.com> 2012-02-23 02:01:42 EST ---
(In reply to comment #5)
> (In reply to comment #4)
> > Fixed for D2 only.
> 
> void main() {
>     int[] array = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ];
>     writeln(array, "~", ++array.length,
>                   "->", --array.length);
>     assert (array.length == 10);        // no problem
>     ++array.length;
>     --array.length;
>     writeln(array, "~", array.length);
> }
> 
> DMD version: 2.057
> ==================
> salih@DB-N150-N210-N220:~/d.ders$ ./dene
> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]~11->10
> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]~10
> 
> No problem...

Huh? What's your point?

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On Wednesday, 22 February 2012 at 15:01:45 UTC, yebblies wrote:
>> DMD version: 2.057
>> ==================
>> salih@DB-N150-N210-N220:~/d.ders$ ./dene
>> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]~11->10
>> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]~10
>> 
>> No problem...
>
> Huh? What's your point?
I'm new learning to java language! Just tried it and I see no problem ...:)

I thank you for your interest in my code snippets...

Best Regards...